I have formatted the USB HD as per your instructions using Acronis True Image Home 11.0, which I already had.
The options shown in the utilities are a little different, it had no option to choose drive letter or 'make active'; however, it made it active by default as I checked in Windows XP disk management and it was shown as active.

Is assigning a letter essential? I guess this could also be changed with Windows disk management.

Anyway, I got the same "wbfs error : bad magic"

I have searched on google, but I can't find much info on this error. The few posts that mention this error seem to talk about a WBFS partition or NTFS.

After much searching and reading, I think it might be a bug with USB GX, though not 100% sure, as I haven't tested on the Wii yet, will try tonight.

There's this discussion here regarding the previous version of USB GX, might apply to 938 too, not sure. https://code.google.com/p/usbloader-...detail?id=1466
A quote from that threadI think that cIOS 249 is never used when playing games in a FAT partition: USB Loader
GX automatically recognizes if this is the case, and silently replace cIOS 249 with
cIOS 222. This is because support for playing from FAT was unavailable in cIOS 249
until rev 17. Now, it seems that rev 18 and 19 introduce this feature, but I do not
think that USB Loader GX make use of it, yet.

Do you have any knowledge on that?

If what's discussed there also applies to GX 938, it would explain why it doesn't work for me.
I haven't installed Hermes's cIOS yet,I will install v4 tonight. I will also get CFG USB loader and WiiFlow.

Just a quick reply to let you know that I've launched Cfg USB loader and the games work perfectly.
I haven't even installed Hermes cIOS yet, I will do that later when the kids give me a chance to use the wii.

Krank, I will install Hermes cIOS because if GX works after installing it, then that would confirm what causes this problem as quoted on my previous post in this thread(#64).

Cile, it is definitely set as primary and active and it's just one partition.
Actually I'm loading apps using the HBC, I haven't installed them yet because I need to install Priiloader as protection before getting to install any channels. So yes, I have tried already what you said.
You have Hermes cIOS installed, correct? I think that's why it works for you. I will be able to confirm this when I install it too.

Krank, I will install Hermes cIOS because if GX works after installing it, then that would confirm what causes this problem as quoted on my previous post in this thread(#64).

Edit - Should have tested this myself long ago. Anyways, GX Loads up fine with Hermes cIOS222 and the games play fine as well. It auto loads IOS249 though so if you have rev 19 or 20 installed it will use that. You need to edit the GXGlobal.cfg to load IOS222 (Change cios = 0 to cios = 1) Although It should work with IOS249 Rev 19 or 20...so not sure what the issue is there. I will install and test.
Edit:

Well, this didn't work for me. Still tried to load IOS249 (I don't know much about GX, I would just use Cfg and call it a day haha)

Edit: Tried to edit via GX Boot standard option. Still tries to auto load IOS249...of course it does end up choosing 222 after trying to load 249. Trying to load Via IOS250 Rev 19 causes it to revert back to IOS222. It also crashes if I try to go back to HBC...

Conclusion: I never have any of these problems with Cfg so I will not test GX any further.